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Abstract:

A mower has one central and at least one laterally arranged mowing
device. The mowing devices each have a mower structure having mowing
knives that are drivable in rotation underneath the mower structure about
a vertical rotation axis. The ends of the mowing knives describe a
circular path, and a guiding element is arranged on at least one
laterally arranged mowing device underneath the mower structure, the
guiding element at least partially surrounding the circular path and
extending downwardly from the mower structure such that cut material cut
by a mowing knife is retained or guided away by the guiding element. In
order to make the distribution of the mown material more regular during
mowing or to avoid accumulations of mown material, the guiding element is
arranged in a circular path section that is located at the front in the
mowing direction and at least one recess is formed in the guiding
element, the recess having a first section which is located between the
central mowing device and a plane that extends in the mowing direction
and in the direction of the rotation axis, and comprising a second
section which is located between the same plane and one side of the
mower.

Claims:

1. A mower having one central and at least one laterally arranged mowing
device, wherein the mowing devices each comprise a mower structure having
mowing knives that are driven in rotation on the underside of the mower
structure about a vertical rotation axis, the ends of the mowing knives
describing a circular path, and wherein a guiding element is arranged on
at least one laterally arranged mowing device underneath the mower
structure, the guiding element at least partially surrounding the
circular path and extending downwardly from the mower structure such that
cut material cut by a mowing knife is one of retained and guided away by
the guiding element, wherein the guiding element is arranged in a
circular path section that is located at the front in the mowing
direction and at least one recess is formed in the guiding element, the
recess comprising a first section which is located between the central
mowing device and a plane that extends in the mowing direction and in the
direction of the rotation axis, and comprising a second section which is
located between the same plane and a side of the mower.

2. The mower according to claim 1, wherein the first and second sections
have different contours from one another.

3. The mower according to claim 2, wherein the contours of the first and
second sections of the recess have different curvatures, wherein the
shape of the contour of the first section represents a region of the
recess that cuts in more deeply from the lower rim of the guiding element
compared with the shape of the contour of the second section.

4. The mower according to claim 1, wherein the first and second sections
merge into one another.

5. The mower according to claim 1, wherein the guiding element comprises
a plurality of guiding element parts, wherein at least on of the first
and the second section is formed in one of the guiding element parts.

6. The mower according to claim 1, wherein a further guiding element is
provided, which is arranged in a circular path section located towards
the central mowing device and adjoins the first guiding element.

Description:

FIELD OF THE DISCLOSURE

[0001] A mower having one central and lateral mowing devices, wherein the
mowing devices each comprise a mower structure having mowing knives that
are drivable in rotation on the underside of the mower structure about a
vertical rotation axis, the ends of the mowing knives describing a
circular path, and wherein a guiding element is arranged on at least one
lateral mowing device underneath the mower structure, the guiding element
at least partially surrounding the circular path and extending downwardly
from the mower structure such that cut material cut by a mowing knife is
retained or guided away by the guiding element.

BACKGROUND OF THE DISCLOSURE

[0002] Mowers of the above-described kind are known and are used for
mowing, cutting and harvesting a wide variety of types of mown or cut
agricultural material. Mowers of this kind can be operated for example as
pulled implements mounted on the trailer coupling of a tractor. Depending
on size, the mowers have a plurality of mowing devices arranged alongside
one another, which each comprise a mowing structure on which discs
equipped on the underside with mowing knives are arranged, the discs each
being driven in rotation about a rotation axis via the power take-off
shaft of the tractor and via correspondingly arranged drive trains. The
mowing knives guided on the discs are guided in a circular path in which
the mown or cut material is cut. Thus, for example mowers having one
central and two lateral mowing devices are known, wherein the lateral
mowing devices are formed with wing-like mowing structures which are
swung up for transporting purposes and can be lowered for operating
purposes. As a rule, in the case of the lateral mowing devices the mowing
knives rotate in opposite directions of rotation such that the cut
material is conveyed towards the middle. The mowing devices can be
equipped with guiding elements or guiding plates which are arranged
underneath the mowing structures and by way of which the ejection,
brought about by the rotation of the mowing knives, of the cut material
can to a certain extent be influenced or guided, or uncontrolled ejection
can be prevented. As a result, accumulations in the form of a swath of
cut or mown cut material can be created in a preferential or targeted
manner and be picked up by an implement running behind, for example a
baler. However, for other fields of application, swath formation is
actually obstructive and therefore undesired, for example during mowing
or shredding of crop residues, which, although they are incorporated into
the soil when the field is replanted or are mown down or cut prior to
replanting, are not intended to be gathered up. Here, it is desirable to
achieve a distribution of the mown or cut material that is as regular as
possible over the entire mown area, in order to inhibit the subsequent
replanting process as little as possible.

[0003] A mower that is designed for such fields of application is
disclosed for example in DE 10 2008 035 037 A1. A mower having one
central and two laterally arranged mowing devices is described. In order
to achieve a distribution of mown or cut material that is as regular as
possible over the mown area, guiding plates are arranged underneath the
mowing structures such that they are arranged only partially along the
circular paths described by the mowing knives or only partially surround
such a circular path. The guiding plates extend downwardly from the
mowing structure and are wherein at the lateral mowing structures they
surround the respective circular path described by the mowing knives only
along a relatively short section in a rear lateral region of a guiding
plate. Furthermore, at the central mowing structure there is arranged a
guiding plate that is open at the front in the mowing direction, the
guiding plate being formed in the rear and the lateral regions of the
circular path and being mounted on the mowing structure in a vertically
adjustable manner. Largely regular distribution of the mown cut material
can be achieved as a result, wherein there is furthermore space for
optimization, in particular over the entire mown area.

SUMMARY OF THE DISCLOSURE

[0004] The object underlying the disclosure is considered that of
specifying a mower of the type mentioned at the beginning, by way of
which the regular distribution of mown material is optimized further.

[0005] According to the disclosure, a mower of the type mentioned at the
beginning comprises a guiding element which is arranged in a circular
path section that is located at the front in the mowing direction,
wherein at least one recess is formed in the guiding element, the recess
comprising a first section which is located between a plane that extends
in the mowing direction and in the direction of the rotation axis and the
central mowing device, and comprising a second section which is located
between the same plane and a side of the mower. A circular path section
that is located at the front in the mowing direction is understood to be
a circular path section which, as seen in the mowing direction, is
located in front of a plane which extends transversely to the mowing
direction and in the direction of the rotation axis. On account of the
fact that the recess has a first and a second section, the deposition of
cut material underneath the mower structure can be influenced optimally,
such that cut material is let through in a particular pre-determinable
amount and for a particular region of the circumference or is held in a
targeted manner in a different region or is deflected. As a result,
regular distribution of the mown or cut material over an entire
deposition area is achieved. Irregular accumulations of cut material are
avoided. Preferably, the two lateral mowing devices are provided with a
guiding element of the abovementioned type.

[0006] The first and second sections may also have differently shaped
contours, such that as a result even more regular distribution of the
mown material can be expected. In particular, the shape of the contour
can in this case play a significant part. It is possible to determine
which contours are optimal for the individual sections and for the
particular cut material and the particular mowing conditions by
appropriate field trials.

[0007] The contours of the first and second sections of the recess can
have for example different curvatures and profiles, wherein the shape of
the contour of the first section represents a region of the recess that
cuts in more deeply from the lower rim of the guiding element compared
with the shape of the contour of the second section. The sections can
also be formed with different lengths from one another, such that for
example the contour of the first section has a longer and flatter profile
and that of the second section has a shorter and more curved profile.

[0008] It is also possible for the sections to merge into one another,
such that the first section leads directly into the second section.

[0009] The guiding element may comprise a plurality of guiding element
parts, wherein the first and/or the second section is formed in one of
the guiding element parts. Accordingly, the guiding element can be formed
by a plurality of segments of a guiding plate, wherein one segment
represents a partial element and covers a particular region of the
circular path. The sections of the recess can in this case be formed on a
segment or also be distributed over a plurality of segments. It is
possible, by replacing only one segment having a particular contour for
one section with a segment having a different contour for one section, to
change the recess as such and adapt it to the changing conditions and
operating states. The guiding element or the guiding element parts or
segments can be formed as bent sheets made of metal, plastics material or
else of an elastic material such as rubber or the like.

[0010] Furthermore, it is possible to provide a further guiding element
which is arranged in a circular path section located towards the central
mowing device and adjoins the first guiding element. In particular, in
this way the cut material cut by the mowing knives can be prevented from
getting into a region located in the central mowing device and forming
accumulations. Accumulations of cut material are avoided. The two lateral
mowing devices can be provided with such a further guiding element.

BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Embodiments of the disclosure are described in detail below with
reference to the accompanying drawings, wherein:

[0012]FIG. 1 is a schematic perspective side view of a mower according to
the disclosure from the front and above;

[0013] FIG. 2 is a schematic perspective side view of a mower structure,
arranged on the left-hand side as seen in the mowing direction, of the
mower from FIG. 1, from the front and below;

[0014] FIG. 3 is a schematic side view of a guiding element having a first
section; and

[0015] FIG. 4 is a schematic side view of a guiding element having a
second section.

DETAILED DESCRIPTION OF THE DRAWINGS

[0016]FIG. 1 shows a mower 10 for attaching to an agricultural tractor
(not shown). The mower 10 comprises a central mowing device 12 which is
adjoined on both sides in each case by a lateral mowing device 14, 16.
The lateral mowing devices 14, 16 are formed as wing-like structures and
are arranged pivotably on the central mowing device in such a manner that
they can be raised or swung up from an operating position for mowing into
a transporting position for transporting and vice versa by way of
actuators 17 or motors, for example hydraulic cylinders. Each of the
mowing devices 12, 14, 16 comprises in each case a mower structure 18,
20, 22. The mowing device 14 that is located on the left in FIG. 1 as
seen from above in the mowing direction MR, or the mower structure 20
located correspondingly on the left, is described in detail in the
following text with reference to the illustration in FIG. 2.

[0017] The central mower structure 18 is equipped with a drawbar 24 which
is connectable to a trailer coupling (not shown) of the tractor and via
which the mower 10 is supported at its front end on the tractor. At the
rear end of the mower 10, running wheels 26, by way of which the mower 10
is guided over the ground, are arranged on the individual mowing devices
12, 14, 16.

[0018] Each mowing device 12, 14, 16 comprises a separate drive train 28,
30, 32 having in each case a drive shaft 34, 36, 38 and an angular
transmission system 40, 42, 44. The drive shafts 34, 36, 38 lead together
into a power split transmission 46 that is drivable by a power take-off
shaft (not shown) of the tractor.

[0019] The respective angular transmissions 40, 42, 44 drive mowing knives
48 located underneath the individual mower structures 18, 20, 22, see
FIG. 2 as an example. The mowing knives 48 are mounted on a mowing or
rotary disc 50 in a pivotable manner by way of pivoting bolts 52 and are
oriented radially outwards by a centrifugal force that acts on them. The
respective rotary discs 50 are drive-connected to the correspondingly
associated angular transmissions 40, 42, 44. The mowing knives 48 can
also be designed in the form of a propeller, such that the mowing knives
48 can alternatively also be driven directly via a drive spindle on the
propeller. The mowing knives 48 and the rotary discs 50 rotate about a
rotation axis 54, wherein the ends 56 of the mowing knives 48 describe a
circular path. To the side of the mower structure 20 there is formed a
side wall 58 which extends downwardly (towards the ground) underneath the
mower structure 20, the side wall 58 bounding or shielding the mower
structure 20 laterally towards the outside in a lateral section of the
circular path. The side wall 58 is adjoined at the front of the mower 10
by a first guiding element 60 in the form of a ring segment. The guiding
element 60 is designed in the form of a guiding plate made of metal,
preferably from sheet steel. A robust plastics material or a rubber mat
could also be used here. The guiding element 60 likewise extends
downwardly underneath the mower structure 20 and represents a boundary or
shield, which extends over a front section, not shielded by the side wall
58, of the circular path described by the rotating ends 56 of the mowing
knives 47.

[0020] The guiding element 60 comprises two or more guiding element parts
62, 64, of which the guiding element parts 62, 64 extend over a section
of the circular path which is located in front of the rotation axis with
respect to the mowing direction MR. A further rear side wall 68 extends
from the side wall 58 about a rear section of the described circular path
of the mower structure 20. A further (second) guiding element 66 extends
over a section of the circular path which extends between the first
guiding element 60 and the rear side wall 68 and thus bounds or shields a
section of the circular path towards the central mowing device 12, the
section being located partially in front of the rotation axis 54 and
partially behind the rotation axis 54. The further (second) guiding
element 66 can in this case directly adjoin the first guiding element 60.
The rear side wall 68 delimits a circular path section located behind the
rotation axis 54 or shields such a section. Furthermore, the guiding
element parts 62 and 64 are arranged such that the guiding element part
64 encloses or shields a section of the circular path which extends in
front of the rotation axis 54 and towards the central mowing device 12,
and such that the guiding element part 64 mainly encloses or delimits a
section of the circular path which extends in front of the rotation axis
54 and towards the side of the mower 10. The formulations "in front of
the rotation axis 54" and "behind the rotation axis 54" should be
understood as the definition of a region which, as seen in the mowing
direction MR, is located respectively in front of or behind the plane
which extends transversely to the mowing direction MR and on the rotation
axis 54. The guiding element parts 62, 64 (which form the guiding element
60) and the further guiding element 66 are formed in the present
exemplary embodiment as segments or elements (parts) of an assembled
guiding plate. However, the guiding element 60 can also be formed in one
piece and have a plurality of sub-regions which are formed or arranged in
a manner corresponding to the above-described guiding element parts 62,
64. Formed on the guiding element 60 is a recess 70 which is open towards
the ground, that is to say downwardly, or a cutout which is open towards
the ground, the recess 70 or cutout comprising a first section 72 and a
second section 74 (see in particular FIGS. 3 and 4 in conjunction with
FIG. 2). The first section 72 is located in the guiding element part 62
and thus extends in front of the rotation axis 54, between the central
mowing device 12 and the plane which extends on the rotation axis 54 and
in the mowing direction MR. The second section 74 is located partially in
the guiding element part 62 but mainly in the guiding element part 64 and
thus extends mainly in the mowing direction MR in front of the rotation
axis 54, between the side of the mower 10 and the plane which extends on
the rotation axis 54 and in the mowing direction MR. In other words, the
sections 72 and 74 bound one another and are separated by the plane which
extends on the rotation axis 54 and in the mowing direction MR. In the
present exemplary embodiment, the sections 72, 74 are formed in different
manners and are complementary to an asymmetrical recess 70 or to an
asymmetrical cutout. However, with appropriate shaping of the sections
72, 74, the recess 70 or the cutout can also be formed in a symmetrical
manner. However, trials have shown here that the configuration of the
recess 70 or cutout with differently configured sections 72, 74 provides
improved results with regard to regularity of distribution of mown
material. Thus, the recess 70 or the cutout has in the first section 72 a
contour that extends more deeply and in a more curved manner than in the
second section 74, while in the second section 74 a contour profile which
is overall longer but flatter than in the first section 72 is formed. In
other words, the shape of the contour in the first section 72 represents
a recess 70 or cutout that cuts in more deeply, starting from the lower
rim (from the rim directed towards the ground) of the guiding element 60,
compared with the shape of the contour in the second section 74 (see in
particular the illustration in FIGS. 3 and 4). The sections 72, 74 are
formed such that they merge into one another at a contour changing point
76.

[0021] Having described the preferred embodiment, it will become apparent
that various modifications can be made without departing from the scope
of the invention as defined in the accompanying claims.